I'm researching light sources and their UV emissions. I'm curious if a 50W, 7500K conventional LED lamp emits any UV light. I found that a 200W tungsten lamp can emit up to 1.5 mW/cm² at 350 nm. Does anyone have data or experience on UV emissions from high-power LED lamps? Specifically, I'm looking for information on UV intensity and wavelength range for such LEDs. Additionally, if anyone has insights on how to characterize these lamps, that would be greatly appreciated.
Led lambalar ultraviyole ışın yayarlar. Özellikle renk çeşitleri ve dalga boyuna bağlı olarak bu durum değişir. Renklerin bulunduğu kelvin aralığı da radyasyon gözlenebilirliğini etkiler.
see fig 3 in
https://www.digikey.com/en/articles/defining-the-color-characteristics-of-white-leds
Mr. Yurii V Geletii , as an expert on the subject, please provide us a concise conclusion to the article you share. Thank you.
Download the fig 3 from the recommended articles. This type of lamps has three LED. The emission at 350 nm is negligible. You can buy LED 365 nm, but still the emission at 350 nm is negligible. A xenon lamp is a good UV light source.
I guess you should have a look at this publication: https://www.researchgate.net/profile/Christopher-Elvidge/publication/223137703/figure/fig28/AS:668490054762497@1536391857026/Spectra-of-LED-lamps-A-Comparison-of-two-white-LED-streetlights-B-Spectra-from-four_W640.jpg
One perhaps can use some spectrometer from OceanOptics or similar e.g. https://www.oceanoptics.com/spectrometers/versatile-spectrometers/
The wavelength of light emitted by LED depends upon the energy gap of the semiconductor while intensity depends on forward biased current.
Thank you for your insights! I appreciate your emphasis on the relationship between light emission and the energy gap of semiconductors. Building on your points, the emission characteristics of lamps are indeed closely tied to their Correlated Color Temperature (CCT) and the fabrication methods used.
There are three primary fabrication types for LED technology:
RGB LED Combinations: This method involves combining individual red, green, and blue LEDs to create white light through color mixing.
Blue LED with Yellow Phosphor (Blue/YAG): In this approach, a blue LED is paired with a yellow phosphor (commonly Ce³⁺-doped yttrium aluminum garnet, or YAG) to achieve white light emission.
Near-UV LED with Multi-Phosphor Conversion (n-UV/Phosphor): This method utilizes near-ultraviolet LEDs alongside phosphor materials that convert UV light into visible light, offering the potential for high-quality white light. However, this technology has not been widely adopted in industrial settings for LED bulb fabrication.
Regarding CCT, when it exceeds 6500K, Planck's law indicates that the lamp will emit a significant number of photons in the blue region, particularly around 420 nm to 480 nm.
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